Rail-Stress of High-Speed Railway Bridges using tong Rails and subjected to Spatial Variation of Ground Motion Excitations

지반운동을 공간변화를 고려한 고속철도 장대레일의 응력해석

  • Ki-Jun Kwon (Department of Safety Engineering, Hankyong National University) ;
  • Yong-Gil Kim (Youil Ensys, R&D Center)
  • Published : 2003.06.01

Abstract

The use of long rails in high-speed railway bridges causes additional stresses due to nonlinear behaviours between the rail and bridge decks in the neighbourhood of the deck joints. In the seismic response analysis of high-speed railway bridges, since structural response is highly sensitive to properties of the ground motion, spatial variation of the ground excitation affects responses of the bridges, which in turn affect stresses in the rails. In addition, it is shown that high-speed trains need very long distances to stop when braking under seismic occurrence corresponding to operational earthquake performance level so that verification of the safe stoppage of the train is also required. In view of such additional stresses due to long rails, sensibility of structural response to the properties of the ground motion and braking distance needed by the train to stop safely, this paper proposes and establishes a time domain nonlinear dynamic analysis method that accounts for braking loads, spatial variation of the ground motion and material nonlinearities of rails to analyze long rail stresses in high-speed railway bridges subjected to seismic event. The accuracy of the proposed method is demonstrated through an application on a typical site of the Korean high-speed railway.

Keywords

long rail;dynamic nonlinear analysis;relative displacement of decks;stresses in rail;spatial variation of ground motion;high-speed railway bridge

References

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